ProWin's own 31 Round magazine for the Tokyo Marui Hi-Capa (IPSC Type). Also suitable for 4.3. Full metal construction for durability. IF you are going to be using this Hi Capa 5.1 in IPSC situations where you drop the magazines onto the ground from height, we recommend you get the rubber bumpers from Nine Ball to protect your magazine butt plate from cracking apart. This magazine has the hole in the middle to indicate where the 10th BB is. There is a rule in IPSC that only allows 10 BBs to be in the magazine so this is actually very useful! Check the RELATED PRODUCTS section below for more detail.